The same study determined 80 percent of baby formula contains the deadly poison as well. The chemicals found in baby food and formula can affect babies' development, including fine motor skills and cognition, pediatrician and toxicologist at Children's Mercy Hospital in Kansas Jennifer Lowry said, USA Today reported.
Gerber was one of the worst offenders with at least one product in the bottom five in every category except infant formulas.
The Clean Label Project, a nonprofit group that focuses on transparency in product labeling, conducted the study. For more information about the Clean Label Project look here. The study tested over 500 products found in stores.
"It is important for consumers to understand that some contaminants, such as heavy metals like lead or arsenic, are in the environment and can not simply be removed from food", Peter Cassell, a FDA spokesperson, told USA Today. Researchers also found that 60 percent of "BPA-free" products actually tested positive for Bisphenol A, also known as BPA.
Arsenic does have the potential to be toxic but, as the World Health Organization explains, it is "a natural component of the earth's crust and is widely distributed throughout the environment in the air, water and land".
This isn't the first time lead has been found in baby foods.
"It is important for consumers to understand that some contaminants, such as heavy metals like lead or arsenic, are in the environment and can not simply be removed from food", said Peter Cassell, an FDA spokesperson.
The executive of Clean Label Project, Jaclyn Bowen, expressed serious concerns over the matter, saying "The baby industry needs to do a better job in protecting America's most vulnerable population".
The Clean Label Project posted a list of products it tested, along with a star-rating grade informed by the California Office of Environmental Health Hazard Assessment, on its website.